Mixer for plastics



March l2, 1929. E. s. MASON MIXER Fon PLASTICS Filed Jan. 13, 1926 gnou/Lto@ Erwin (3 Mason,

a tforMen/M Ail) Patented Mar. l2, 19,29.

Unirse STATES PATENT orrlcr..

ERWIN S. MASON, OF NORW'OOD, OHIO.

MIXER FOR PLASTICS.

Application filed. January 13, 1926. Serial No. 81,102.

Another object is to provide a means comf pricing a baffle plate for directing a cur.- rent of air under pressure inside the tank, said means also serving as a splash plate to prevent leakage of the contents there.- of and as a scraped for removing any substance adhering to the cover of thetank.

lAnother object is to so construct and position the baffle plate that cleaning of the tank and baiiie plate is facilitated.

These and other objects are attained. by the means described herein and disclosed in the accompanying drawings, in which:

1 is a plan view of the rear of a dough mixing machine embodying the device of my invention.A

Fig. 2 is a cross sectional view on line 2-2 of Fig. 1.

Fig. 3 is a sectional View on Aline 3-3 of Fig. 2. 1

Tn the device of my invention the air supply .lines are iixedly secured to a stationary cover for the tank, to admit air into the tank through perforations in the cover. This means obviates the connecting` and disconnecting of the air supply each time the tank is raised'or tilted. A baillle plate is provided within the tank for directing the air interiorly of the tank. Tn addition to' directing the air, this plate, by novel arrangement and construction, serves also as a splash plate forA protecting otherwise exposed joints of the tank, functions as an interceptor and cooler of the substance being mixed and thrown against the wall of the tank, ac ts as scraper for removing substance adhering to the under surface of the cover and permits of ready cleaning of the interior of the tank andbaiiie plate. y

The dough mixer comprises a base 4, tiltable mixing tank 5, an agitator 6, and a stationary arcuate canopy cover 7. The base 4t, carries the Vdriving mechanism (not shown) for rotating the agitator 6 about its shaft 8, the ends 9 and 10 of which are Journalcd in 'suitable bearings in the leg frames 11 and 12. The tank 5 is adapted to be tilted about the shaft 8, to assume a substantially horizontal position as shown by dotted lines in Fig. 2 for dumping the contents tliereof andfor cleaning purposes. The tilting means comprises a selectively driven shaft 13, carrying pinions 14 and 15, which engage gear sectors 16 and 17, secured to the end walls 18 and 19 of the tank 5.

ln order to effectively seal the tank whenr the device is in an operative position, the ripper ends 21 of the end Walls 18 and 19 are made arcuate in form and are provided with integral, longitudinal, arcuate flanges 20, (see Fig. 3). The flanges 2O are provided with longitudinal grooves 22 for receiving a longitudinal arcuate tongue or key 23, secured to the under face 29, of the canopy cover 7, by means of rivets or screws 2li. The arcuate parts are constructed with radii equal in length to their respective distances from the center of shaft 8, about which the tank may be tilted. Thus it will be apparent that when the tankis in an operative position, the tongue 23 and the groove 22, form an effective seal between the `sides of the tank and the canopy cover for precluding any splashing of the contents therefrom. c

The canopy cover 7 is fxedly supported above the tank 5 by stanchions 25, secured to thel leg frames 11 and 12. Tntegral with or connected to stanchions 25, are arcuate cast members 26 and 27 which serve to support the canopy and to impart to it the arcuate shape of the adjacent members. tiifening member 27 is secured to the forward end of the canopy cover to insure perfect. coincidence of the under face 29 of the cover 7 with edge 30 of the frontwall 31 of the tank. At the rear edge 82 of the canopy cover is secured. a longitudinally extending angle iron 28 faced with a rubber strip 83, which cooperates with the rear wall del of the tank to preclude leakage and running of the contents thereof down the rear Wall to the floor or base.,

Arectangular baflie plate is secured to the ends 18 and 19, and the rear wall 34 of the tank, said plate beingspaced from the rear wall 34 by spacer brackets 36. The upper edge 37 of the plate 35 is brought within close proximity of the canopy cover for scraping from the under side of 'the cover any dough or sticking substance adhering,T thereto prior to the tilting of the tank. As the canopy is stationary, and the plate 35 moves with the Vtank while being tilted, it is apparent that the edge 37 will scrape 'the entire exposed under surface of the canopy cover. The lower edgre 38 of the plate is disposed below the joint at the top edge of the rear wall 3a. Thus, any substance splashed toward the plate by the agitator will be precluded from forcing its way through the joint.

Riveted or otherwise lixedly' mounted over an aperture 390 in the iin-movable canopy cover 7, is an air supply connection 39, which .in conununieation with the inside of the tank behind the baille plate or splash plate Agir entering` the tank in the direction of the arrows will be directed downwardly along the rear wall and bottom of the tank, aud will be exhausted through the vent 'or exhaust valve 40. Thus, the substance to be mined is cooled and the blast of air is utilized, in addition, to cool all sides of the tankl Plato 35 serves also as an interceptor for the substance being` mixed, which tends to leave theV agitator because of centrifugal force and to strike the rear wall of the tank. The passing` of the' air alone, the plate overcomes thev heat of friction thus created and keeps theplate in a cool condition. Vent or exhaust 40 comprises a casting il of any suitable length positioned over an aoerture Il?, in the canopy' cover, and is1 provided with a freely swinging door 43, hingedly mounted on the casting' atei. By this exhaust means,

. no foreign particles can enter the tank, as

the door opens but slightly, the amo-unt of opening dependingl upon the amount of air admitted to the tank. rlhe cover is providec witlrinlets for ingredients, and doors for closing' the inlets.` lifecli'anisms for controlling` the doors are designated by l5 and LlG, and are usual equipment en the type of tank described.

It should be noted. that in the closed or operative position, the tank is leak proof due to the tongue and groove construction, and the joint at the canopy cover and rear wall of tank protected b v the baille plate 35, Furthermore, Vthe tank may be tilted without disconuc ,fr the air suppl;f liti, which may be aiu iatically shut oil' upon the ti ting' of the tank. Upon tilting; of the tank, the plate 35 functions as a scraper for removing adheringv matter from tlf-.e under face of the canopy cover.

TWhile the exhaust 4i() is shown as a longitudinal aperture provided with a swinging door, it may consistof any suit-V able exhaust means, such as an opening; provided with a pipe which may carrv a butterfly or other suitablev valve. ln this manner, air from the mixing tank may be eX- hausled extoriorly of the room in which the machine 1s situated. Wha-t I claim 1s:

VLin a device of the classl described, the

combination with a base, of an arcuate canopy cover lixedly mounted upon the base and provided with a perforation near its rear edge, an air supply line iXedly secured to the cover over the perforation therein, transversely disposed arcuate tongues on the under face of the cover, stilfening members extending longitudinally of the cover, means for precluding` leakage, a tiltable tank adapted in operative position to be closed by the cover and comprising' end walls, the top edges of which are arcuate to conform with the arcuate' cover, a grooved flange boundingg` said top edges, the groove receiving the tongue on the cover, a baille plate disposed within t ie tank adjacent and parallel to the rear wall thereof, and disposed forwardly of the perforation in the cover when in an operative position, the upper edge of the plate being disposed in close proximity with thelarcuatc under face of the canopy cover for removing` adhering substance from the cover, the plate extend'- ing below the joint made by the canopy cover and rearv wall of the tank, tilt-ing means operable upon the tank, agite-ting means within the tank, and an exhaust port valve for dischareing air from the tank.

2. ln a device of the class described, the combination with a base, of a perforate arcuate canopy cover tlxe'dly mounted upon the base, an air supply linevfixedly secured to the cover in registration with a perforation near its rear edge, a ti'ltable mixing tank adapted normally to be closed by the cover and comprisii'ig endk walls, the upper ends of the walls being' arcuate in form to conform with' the canopy cover, co-operative slidmeans on the cover and the end walls Vofthe tank for effecting a seal therebetween,

means for sealing the remaining tween the coverQ and tank, a rectangular baille plate disposed within the tank adjacent the rear wall thereof, its top edge being disposed in close proximity with the lower face of the arcuate canopy cover' for removing adhering' substance from the cover, the plate extend ,i below the joint between the rear wall of tank aud the rear educ of the canopy cover, the' plate further serving' as au interceptor and air dcflector, meansV for tilting the tank, agitating 'means within the tanigaud a valve associated with a second joints beperforation inl the canopy cover for discharging air from the tank.

3. ln a device of the class described, the combination ofv avperforate stationary canopy cover, an air supply line secured to the cover and registeringv with one of the perfoations, au exhaust valve associated with another of the perforations, a tank, movable iii) relative to the cover, and comprising side walls adapted to register with the canopy cover to eiiecta seal therebetween when the tank is in an operative position, a baille plate within the tank for directing the air from the supply line, said plate being so disposed as to serve also as a splash plate, as an interceptor plate and as scraper, means for tilt-ing the tank, and an agitator within the tank,

Ll, ln combination with a tiltable mixing tank, an agitator, a baille plate disposed within the tank adjacent and spaced :from a wall thereof, a 'fixed periorate canopy cover for the tank, means carried by the tank for scraping the under side ot the canopy cover, an air supply line secured to the canopy cover in registration with a perioration therein tor admitting air under pressure into the tank, means for tilting the tank, and means associated with the remain ing pertorations in the cover for controlling the feeding ot ingredients into the tank andfor air exhaust.

perforation near its rear edge and an eX- hanst port near its opposite ec ge, a tank movable relative to the cover, a baille plate wit-hin. the tank and rspaced from the rear wall thereof, an air supply connection fixedly secured to the cover and over the perforation for admitting air into the'tank between the baille plate and the rear wall,

means associated with the baille plate tor removing adhering substance from the under side ot the cover, agitating means within the tank and means for moving the tank relative to the cover.

6. The combination ot a` tank nd a cover therefor n'iovable relative one to the other, the cover having a erforation for admitting a cooling medium into the tank, an agitator in the tank, and baille plate carried by the tank for shielding the opening in the cover 'from substance within the tank operated upon by the agitator' and for directing a cooling medium from the opening in the top to the substance in the tank.

7. T he combination of a tank and a cover therefor movable relative one to the other, the cover having a perioration lor admitting cooling); medium at one L,ale oi the tank, a revolnble ag', ator in the tank moving downwardly below the opening in the cover, and a depending baiiie plate disposed between the opening in the cover and the uppermost portion of the agitator' whereby the baille precludes entry into the perforation in the cover, oi any substances operated upon by the agitator.

8. The combination of a cover, a tank, the tank and cover having relative movement one to the other, a baille plate carried by the tank and spaced from a wall thereot' for intercepting substance directed toward said o. The combination ot a cover having a wall, a scraper edge on vthe baille plate, the scraper edge of the plate being adapted for removing adhering substance from the under surface oi the cover upon relative movement of the tank and cover.

9. The combination with. a support means, of a cover iixedly secured to il e support means, a tank adapted to be moved relatively to and closed by the cover when in an operan tive position, means carried by the cover tor admitting air under pressure into the tank, air e-lhaustineans, agitating means, and a baille plate for directing the air under pressnre and tor intercepting substance 'thrown by the agitator. y

l0. The combination of a stationary cover, a tank movable relative to the cover and adapted to be closed by the cover when in an operative position, an agitator and a kbailleplate within the tank, the baille plate being adapted for intercepting substance thrown from' the agitator toward the joint made by the cover and the tank.

lil. The combination oi a stationary cover, a tank movable relative to the cover and adapted to be closed by the cover when the tank is in an operative position, an agitator in the tank, a baille plate comprising a scraper portion at its upper edge, the baille plate being so positioned as to serve as scraper for the under side oi the cover, and

as an intercepter 'for substance thrown from the agitator.

l2. The combination of a tiltable tank comprising a front and rear wall, a bot-tom, and end walls having arcuate top portions, an arcuate perforate stationary cover for closing the tank when it is in an nprivht position, a depending flange secu-ed to the cover adjacent its rear edge, a resilient padding on the iiange, the padded iange being adapted to abut the rear wall oi? the tank upon the tank being righted, a baille plate comprising a scraper adapted to scrape adhering substance 'from the under side of the arcuate cover, thebatlie plate being spaced from the rear wall and extendingVY downwardly for a distance so as to protect the joint made by the rear wail andthe cover, from substance boing mixed within the tank,

means associated with a perforation in the f cover tor forcing air under pres ire downwardly into the tank between the baille plate and the rear wall, agitator', and an exhaust valve over a second perforation in the cover.

13. The combination with a tiltable tank comprising walls and a bottom, a stationary` cover therefor, a depending flange carried by the cover and which the rear wall of the tank abuts tor etiecting a seal when the tank is in an upright position, an agitator within the tank, and a baiie plate spaced from the rear wall of the tank and extending downwardly to protect the joint made by the rear wall and the depending flange from substance directed toward the joint by the action of the agitator. Y

lt. The combination with a tilt-able tank comprising walls and a bottom, a stationary perforate cover therefor, a depending ange carried by the cover for abutting the rear wall of the tank when the tank is in an upright position, for effecting a seal, an agitator within the tank, a baille plate spaced from the rear wall of the tank and extending downwardly for protect-ing the joint made by the rear wall and the depending flange from substance directed toward the joint by the action of the agitator, means associated with a perforation in the cover for admitting air under pressure into the tank at a point intermediate the baille plate and the rear wall of the tank, whereby the baffle plate is cooled and the air is directed downwardly into the tank by the baftle plate, and air exhaust means associated with a second perforation in the cover.

l5. The combination of a. tiltable mixing tank comprising side walls, a front and rear wall, and a bottom, a. stationary perforate cover therefor, means associated with the rear wall and the cover for effecting a sealer joint therebetween when the tank is in a normally upright position, a baffle plate coinprising a scraper, vspaced from the rear wall and the sealed joint and extendingr for a distance below and above the sealed joint to protect the oint from substance being mixed within the tank, the scraper on the baille plate being adapted for scraping adhering substance from the under side of the cover upon tilting of the tank, an air connection over a perforation in the cover for admitting air under pressure into the tank, said jerforation and connect-ion being disposed between t-he baille plate and the rear wall of the. tank whereby the baffle plate and the tank walls are cooled by the incoming air, an exhaust valve disposed over a second perforation in the cover, and an agitator within the tank.

16. The combination of a tiltable mixing tank comprising side walls and a bottom, a stationary periorate cover therefor, abutting means carried by the cover adjacent an edge thereof, for abutting a wall of the tankY when the tankis in an operative position, for etii'ecting a seal, a baille plate spaced from the rear wall and the sealed joint, for pro tecting said joint from material being mixed, an air connection over one of the perforations in the cover for cooling the baille plate and tank walls by air under pressure forced therethrough, the said connection and the `perforation being disposed between the baffle plate and the said wall of the tank, an agitator within the tank, and means for exhausting the air admitted int-o the tank.

17. rlhe combination of a tiltable mixing tank comprising walls and a bottom, a stationary perforate cover therefor, abutting means carried by the cover adjacent an edge thereof, for abutting a wall of the tank when the tank is in an operative position, for effecting a seal, a baille plate spaced from the wall and the sealed joint, for protecting said joint from substance being mixed, an air connection over one of the perforations in the cover for cooling the baffle plate and tank walls by air under pressure forced therethrough, the said connection and perforation being disposed between the baffle plate and said wall of the tank, a. scraper adapted for scraping adhering substance from the under side of the cover when the tank is tilted, an agitator, and air exhaust means.

18. The combination of a tiltable mixing tank comprising wallsand a. bottom, astationary cover therefor, means associated with one wall and the cover for effecting a sealed joint therebetween when the tank is in a normally operative position, a baiile plate spaced from the wall and comprising a scraper, the scraper being disposed upon the upper portion of the baiile plate and in close proximity with the cover, for removing adiering substance from the under side of the cover, an agitator within the tank adapted for direct ng mixable substance against the baiiie plate, and means for moving the ator and tilting the tank.

The combination with I a tiltable hiking tank comprising walls and a bottom, stationary cover therefor, means associated with one wall and the cover for effecting a. sealed joint therebetween when the ERWIN S. MASON- tank is in a normally operative position, a 

